Wikipedia: Google Talk - Provides a description of the components of the application and its future releases. - http://en.wikipedia.org/wiki/Google_Talk
Google Talk for Developers - Provides three open source API to allow developers to use the protocol in theirs applications. - http://code.google.com/apis/talk/talk_developers_home.html
Google Groups: Google Talk Help Discuss - Provides a discussions group to share questions about the software. - http://groups.google.com/group/Google-Talk-Help-Discuss
Customize Talk - Offers news, tips and tricks about the software. - http://www.customizetalk.com/
Google Talkabout - The official weblog about instant messaging, voice, and other communications with the software. - http://googletalk.blogspot.com/
Google Talk - Official page of the software. Provides tutorial for beginners and link to download. - http://www.google.com/talk/